Automatic motor starter



Dec. 17, 1929.

H. W. CHENEY AUTOMATIC MOTOR STARTER Filed June 7. 1920 Patented Dec.17, 1929 Unit HERBERT w. CHENEY, or MILWAUKEE, WISCONSIN, ASSIGNOR roALLrs-or-IALMEns MANUFACTURING COMPANY, or MILWAUKEE, WISCQNSIN, aoonronn'rron or DELAWARE AUTOMATIC Moron sr nnrnn Application filed June7, Serial K6 3873237. Renewed July 6, 1925 This invention relates tomotor starters and particularly to that typewhich is automatic inoperation. One of the objects of the invention is the provision of amotorstarter of simple and efficient construction and operation. Anotherobject is the mutual sim plification of the contact mechanism and theoperating mechanism therefor. Another object is the provision of a motorstarter which will open when no voltage or low voltage obtains on theline but in which the usual additional no voltage magnet has beeneliminated. Another object is the provision of a "construction in whichcomparatively small control magnets are permissible. "Another object isthe provision of a mechanism in which the operation of the runningcontrol magnet is made dependent upon the armature of the startingcontrol magnet remaining in the same position. In connection with thisobject'it is a further object that the construction be such that thestarter will return to off or circuit opening position from either'itsstarting or running position upon the occurrence of low voltage on thellne. Other Ob ects Wlll appear hereinafter as the description of theinvention proceeds.

The novel .featuresof the invention will appear from this specificationand the accompanying drawing forming a part thereof and disclosing oneembodiment of the invention and all these novel features are intended tobe pointed out in the claims.

The single figure ofthe drawing is a diagrammatic showing of anautomatic starter embodying the features of the invention.

In the drawing,'the starterhas been shown as applied to a three-phasemotor 1, it being understood, however, that the starter may be readilyapplied to motors of other types. The starter provides, ingeneral, for

a connection of the leads 2, 3, 4; of the motor l to the line conductors5, 6, 7, first through a transformer for starting purposes and thendirectly to the line conductors for running. The main contacts of thestarter include starting, running and movable cooperating contacts.Contacts, 8,9- of the starting contacts are connected to' autotransformer 10 and the contacts 11-, '12. connected to the auto tion tothe lever 29.

transformer 13. Of the stationary running contacts, contact 14 isconnected to start- 7, 6 respectively by means of flexible leads 25, 27respectively, in like manner. For the sake of clearness the switchmember 28 for the movable contacts has been shown in side ing contact 15and these contacts are together .24 and 26 are connected to lineconductors elevation as have also the starting and running contacts, themovable contacts on being co-operable with starting contacts sand running contacts 1". The operatingjmechanism of the movable switch member28 is so designed that contact may be madebetween the movable contactsand either the starting or running contacts. The movable switch member28 is pivoted in any suitable manner as on the pin 30 carried by theactuating lever 29. The lever 29 ishere shownas rigidly associated withthe shaft 35, it being, however, understood that any other suitablemeans maybe utilized fortransmittingmo- I The movable switch member 28is provided with an extension 31,

Which has pivoted thereto at 32 a lever 33 a rotatable about thestationary pivot 34. It

will be clear thatif the lever 29 is swung in a clockwise direction themovable contact m will be shifted to the left and by reason of theaction-of the lever 33, also in an upward direction, sothat at the endof the motlon, butt contact, witha slight final sliding motion Will'bemade with starting contacts 8. If the lever 29 is swung in acounterclockwise direction from the position shown 1n the figure, themovable contacts will in similar-manner be moved into contact with therunning contacts 1". Theoperatingmecha 'anism heretofore explained inits broad aspects is fully set forth inapplica'ntscopend ing application'S'. $1,334,887 liled Oct 29,

1919, now Patent N 0. 1,574,417, issued February 23, 1926, and referencemay be had to that patent for a fuller description of one of the formswhich it may take.

The starter is provided with a starting control coil 36 and a runningcontrol coil 37 which coils are here shown as mounted on the outer legsof an M-shaped core 41. The coils 36, 37 may act on an armature havinglegs 38, 39 mounted for pivotal movement on the central leg 40 of thecore. The armature 38, 39 is operatively connected to the shaft 35.

F or setting the starter into operation a c011- trol switch 42, whichmay be actuated in any desired manner but here shown as of the manualtype, is provided. One contact of this switch is connected by means ofconductor 43 to the line conductor 5, and the other contact is connectedto the conductor 56 and one of the contacts of a control switch 44, thepurpose of which latter in this instance, as will be more fully setforth, is to cause such operation of the starter as will open thecircuit of the controlled motor. The other contact of the switch 44 isconnected to conductor 45 which is in turn connected to one terminal ofthe coil 36, and also to one terminal of the coil 37. The other terminalof coil 36 is connected to conductor 46 which is in turn connected toone of the lower contacts 47 of what may be termed a transfer switch 48.The other lower contact 49 of the transfer switch is connected throughconductor 50 to line conductor 6. A shunt circuit is provided for theswitch 42 comprising conductor 51, shunt switch 52 (which has stationarycontacts 53, 54) holding coil 55 and conductor 56.

The shunt switch 52 is associated with a bell crank 57 which isswingable by means of the rod 58 which has a lost motion connection 59with a projection or pin movable in unison with the armature 38, 39. Theshunt switch 52 is also operable by means of a core 61 as sociated withholding coil 55.

The transfer switch 48 is operable by means of a core 62 associated withthe holding coil 55 by means of a lever 63 acting upon the rod 64 whichcarries the transfer switch member. The transfer switch is biased, by aspring 65, to a position where the contacts 47, 49 are bridged and isheld in its biased position, when the starter is in open circuitposition, by means of a latch 66 which is engageable with the projection67 on the rod 64. The latch 66 may be pivoted at 68 so as to provide fora free passage of the projection 67 in a downward direction, anysuitable means being provided for holding the latch in the positionshownon the drawing. The upper :ontacts 70, 69 of the transfer switch areconnected to conductors 50 and 71 respectively. Conductor 71 isconnected to one terminal of the coil 37, the other terminal of which isconnected by conductor 72 to conductor 45.

A rod 73 having an abutment 74 at one end thereof is here shownpivotally associated with the leg 38 of the armature. Surrounding thisrod is a member 75 here indicated as of tubular form having an opening76 through which the rod 73 passes. A spring 77 is disposed between theabutment 74 and the upper end of the tube 75. A rod 78 is associatedwith the tube 75 and forms at its lower end a piston rod 79 for thestationary dash pot 80. The rod 78 is also provided with a lug orprojection 81 which is coactable with one arm of a bell crank lever 82.The other arm of this bell crank lever has pivotally connected thereto arod 83 associated with the latch 66.

The armature 38, 39 is provided with a centering spring 84 attachedthereto in such manner that when the coils 36, 37 are deenergized thearmature will assume its midposition and cause the movement of themovable switch member to off position.

An impedence coil 86, the purpose of which will be hereinafter setforth, is provided in the circuit including the conductor 88 in whichare also included relay contacts 89, 90. The other terminal of theimpendance 86 is connected to the conductor 87 which is in turnconnected to the conductor 56. The conductor 88 is connected to thestationary running contacts 16. The relay contacts 89, 90 are bridgeableby relay switches 93, 94 respectively which are operable by the cores91, 92 associated with coils 18, 19 respectively.

The operation is as follows:

When the parts are in the open circuit position as shown in the drawingand it is desired to start the motor, the control switch 42 is operatedto its closed position, the starting control coil 36 being thenenergized by reason of the completion of the following circuit; fromline conductor 5, conductor 43, switch 42, switch 44, conductor 45, coil36, conductor 46, transfer switch 48 through contacts 47, 49, conductor50 to line conductor 6. Energization of the coil 36 will cause the leg38 of the armature to swing in a clockwise direction thereby swingingthe movable contacts 20. 21, 22, 24, 26 into engagement with thestationary starting contacts 12, 9, 15, 11,

8 respectively, in the manner already hereinbefore noted, thusconnecting the motor 1 to the line through the auto-transformers 10, 13for starting purposes, as will be clear to those skilled in the art Themovement of the leg 38 of the armature causes the spring 77 to be putunder compression thus storing energy therein. If the leg 38 remains inits attracted position, the spring 77 will commence to expand, giving upits stored energy, and thereby lifting the tube 75. Inasmuch as themovement of the tube 75 is retarded in the upward direction by thedashpot 80, this movement will take place slowly. In its clockwisemovement the leg 38 of the armature, by reason of the connection betweeni and the rod 58, will (ause theclosurc oi shunt switch 52.

A lay-pass or shunt isthereby established aroundthe control switch 42 byconductor 51, shunt switch 52, coil 55 and conductor 56. It thereforeimmaterial whether the operator new releases the control switch 42 ornot, the starting operation will nevertheless automatically continue Anew circuit is now establi hed through the starting control coil 36 andtheholding (oil 55, as follows: conductor 43, conductor 51, shunt switchsociated therewith, reaches the bell cranl lever 82, the latch 66 willbe withdrawn to the left thereby releasing the transfer switch which ispulled upwardly by the core 62. The transfer switch 48 is thereby movedinto contact with the upper contactstitl and "hereof, thereby energizingthe running control coil 37 through the following circuit? conductor l3,conductor 51, shunt switch 52, holding coil 55, conductor 56, switchlrl, onductor 45, conductor 72, running control toil 37, conductor 71,transfer switch 48 through contacts 69 and 70 to conductor 50.

This circuit. it will be noted, is fed from line conduttors 5, 6. Thecircuit of the starting control coil. 36 is, of course,-by the samemovetnent, broken by the transfer switcn leaving the contacts i7, 49 Thecoil 37 new acts upon the leg 89 of the armature to cause the same toswing in a counterclockwise directionand when it h s moved a suiiicientdistance, the :hunt switch 52, opens by reason of the movement of therod 58 to the right caused by the operative connection between said rodand the armature. The opening of the shunt switch caui e-sdc-energization of theholdr coil and the transfer switch i8would n dropbut for the fact that the project-ion on the 39 of the armature nowengages the left ha lend of the lever 63, thereby holdi ne'er switch inengagement with ts ctuiiacu, I

nowc

hi and 70.

'cui hwhich may be termed a i running it, is established through therunning control coil 37 by reason ot the engagement oi movable contactwith stationary run contact 16 as follows: relay contacts l 93,conductor 88, impedance coil 86, conr 87, contlu tor {-6, switch ll,conductor 4:5, conductor 722, coil. 37, conductor 71, trans t p? L iiL'.CEUl' at). i his circuit, it w llqbe noted, is

At the same time, a 7

ch d8 through contactsot 70, to 0011- fed from line conductors 6, 7.,-It will be observed that the impedancecoil 86'is now connected inserieswith the runningcontrol coil 3'7 and this connection occurs whenthe mov able contacts 22, 26 of the controller have been moved intoengagement with the sta tionaryrunning contacts 14,16 and 17respectively, thus connecting the motor directly to the line, In otherwords, when the leg o"? the armature is in the position shown in thedrawing the iu'l'lpower oft the coil 57 is util zedto bring it to fullyattracted position'and when that position has been reached the currenttherethrough is cut down by the impedance coil for purposes of economyof current. The coil SGmay also be wound on trol sw ing coil andpreventingenergization thereof. The starting control coil will thus bemaintained energized through switch 42 and even after latch 66 releasesthe transfer switch the latter will not move inasmuch as coil is notenergized. As soon as switch 42 is released or opened, coil 55 will nolonger be shunted and will actuate transfer switch 48, and the runningconnection will be made as alreadyset forth hereinbefore.

If it desired to stop the motor, the switch 4% is operated to its openposition and, as may be seen from the circuit hereinbefore tracedthrough the coil 37. the latter will be thereby de-energized and all ofthe parts will return tothe position shown in the drawing. In view ofthe fact that the relays 93, 94 are also included in the running circuitof the coil 37, the latter will also be ole-energized when either ofthese relays is operated to open position by an overload on the motorcausing effective energ'zation oi the coils 18, 19. It is moreoverpointed out that inasmuch as the running control coil 37 is at first fedfrom line conductors 5, 6 through a circuit which does not include theabnormal-condition relay contacts and then from lines 6, 7 through acircuit which does include these contacts, there will be no possibilityof the coil 37 bein de-energized by reason. of a momentary overloaduntil the motor is directly connected to the line.

trol coil 37 is at all times during the operabe de-energizedby apredetermined low volta e on the line and the parts will therefore also:assume the open circuit or off position under these conditions.

tion of the motor connected to the line, it will a It will moreoverbeobserved that if low voltage obtains on the I line duringtliestartingoperation, that is, 0U

during the time that the leg 38 of the armature remains in attractedposition with respect to the coil 36, the parts will also assume theopen circuit position, thereby cutting out the motor, by reason of theresultant deenergization or effective weakening of the coil 36. The sameresult may be secured by actuation of the switch 44 to its open circuitposition for, as may be seen by referring to the circuit, previouslytraced, through coil 36 during the starting operation, the switch 44 isincluded in that circuit.

It will be noted that the closing of an energizing circuit through therunning control coil 37 by the transfer switch 48 depends upon thecontinued energization of the starting control coil 36 for apredetermined time, that is, the armature 88 must remain in itsattracted position with respect to coil 36 a time determined by the timeelement of the dashpot 80. If low voltage should obtain on the line thusweakening or tie-energizing coil 36 the armature 38 will rotate in acounter-clockwise direction and the tube will drop back. The projection81 will therefore not have reached the bell crank 82 to withdraw thelatch 66 to thereby release transfer switch 48. If full line voltageshould now again appear there is no possibility that, merely by reasonof this fact, the controller will be operated to its running position,as may occur in certain instances of the prior art. It would benecessary to again close switch 42, thus moving the controller tostarting position.

It will be noted that by reason of the fact that the single set ofmovable contacts make butt contact with both starting and runningstationary contacts, it has been possible to simplify the automaticoperating mechanism of the controller, and much smaller operating coilsare necessary.

It should be understood that it is not desired that the inventionclaimed be limited to the exact details of construction shown anddescribed, for obvious modifications may occur to a person skilled inthe art.

It is claimed and desired to secure by Letters Patent:

1. In a device adapted to control the starting of a motor, comprising avoltage reduc- 1ng means, a switch movable in one direction forconnecting said motor to said voltage reducing means to start the sameand in a reverse direction for connecting said motor directly to itssource of supply, electromagnetic actuating means for said switch, meansfor initiating movement of said actuating means to starting position,means for maintaining said actuating means in starting position apredetermined time independently of said initiating means, and meansresponsive to the movement of said actuating means for reversing thedirection of said movement.

2. In an automatic motor starter of the .type for connecting a motorfirst through a transformer to the line and then directly to the line,starting and running coils, a unitary armature therefor, means forclosing the circuit of said running coil, and means associated with saidarmature for causing operation of said circuit closing means apredetermined time after said armature has moved to starting positionwhile said armature remains in the same position.

3. In an automatic motor starter of the type for connecting a motorfirst through a transformer to the line and then directly to the line,starting and running coils, a unitary armature therefor, means forclosing the circuit of said running coil, and energy-storing meansassociated with said armature for causing operation of said circuitclosing means a predetermined time after said armature has moved tostarting position while said armature remains in the same position.

4. In an automatic motor starter of the type for connecting a motorfirst through a transformer to the line and then directly to the line,starting and running coils, a unitary armature therefor, means forclosing the circuit of said running coil, and a spring associated withsaid armature put in energystored condition by movement of said armatureto starting position, retarding means connected to said spring, andmeans associated with said retarding means for causing actuation of saidcircuit closing means where by said circuit closing means is actuated apredetermined time after said armature has reached starting positionwhile said armature remains in the same position.

5. In an automatic motor starter of the type for connecting a motorfirst through a transformer to the line and then directly to the line, astarting coil, an armature therefor, means for closing the circuit ofsaid coil, means associated with said armature for shunting said circuitclosing means, and means other than said armature for holding saidshunting means closed.

6. In an automatic motor starter of'the type for connecting a motorfirst through a transformer to the line and then. directly to the line,a starting coil, a running coil, an armature for said coils, means forclosing the circuit of said starting coil, and means associated withsaid armature for shunting said circuit closing means, and means forestablishing a circuit for said running coil through said shuntingmeans.

7. In a motor controller of the type controlled by an abnormal-conditionrelay having contacts, said contacts connectible to a supply line, arunning control coil, means for connecting said running coil directly tothe line and then for normal running condition connecting it to the linethrough said abnormal-condition relay contacts.

8. In a motor controller having running contacts electricallyconnectible to a supply and running contacts electrically connectible toa supply line having a plurality of con ductors, a running control coil,means for changing the connection of said, coil to the line from oneconductor to another when the controller changes position from startingto runningwhereby the nature of controlgof said coil 1s changed. i

10. In a motor controller having starting and running contactselectrically connectible to a supply line, a running control coilhavingtwo possible circuit connections to the line, a switch common tosaid connections for closing the circuit of said running coil, and meansfor maintaining said switch" ClOSetl-hlld one of said connectionscomplete while" the controller moves from starting to running position;i

11. In a motor controller having starting and running contactselectrically connectible toa supply line, a'running control coil havingtwo possible circuit connections to the line,a switch common to saidconnections for closing the circuit of said running coil, means formaintaining sai'd switch closed and one of said connections completewhile the controller moves from starting t'o'running position, and meanscontrolled 'by-said controller for opening said connection andestablishing the other connection when said controller reaches runningPUSIIIQ'IL 1 v 12.',In a motor controllernaving starting and runningcontacts electrically connectible to a supply line, a' running controlcoil-haw ing two possible-circuit connections to the line, means formaintaining one of said connections while the controller moves fromstarting to running position, means controlled by said controller foropening said connection and establishing the other connection when saidcontroller reaches running position, and abnormal-conditien relaycontacts in said other connection.

13. In a motor controller having starting and running contactselectrically connectible to a supply line, a r-unning'control 'coilhaving two possible circuit connections to the line, means formaintaining one of said connections while the controller moves fromstarting to running position, means controlled by said controller foropening saidyconnection and establishing the other connection whensaidcontrollerreaches running posi tion, and a resistance in said otherconnectio'n.y

14. In a motor controller having a start ing and a running coil andenergizing connections therefor, starting and running contacts, a singlemovable switch member adapted to makebutt contact with either thestarting or running contacts,means for transferring energizingconnection from said starting coil to said running coil, and meansassociatedwith and dependent upon energization of said running coil formaintaining the connection through said coil.

15. In an automatic starteradapted to control an asynchronous motor,comprising a single movableswitch having a single set of contactsadapted to connect the motor to either a voltage-reducing device forstarting ordirectly to the line for running, a starting coil, a runningcoil, an armature associated with 'sa-id coils, means for operativelyconnecting said armature and said switch, connections between said coilsand the line, a

normally closed switch for controlling the circuits of both of saidcoils, a normally open switch for controlling the circuit of saidstarting coil, a switch for transferring the line connection from saidstarting coil to said running coil, said switch being biased to connectthe starting coil to the line, means for holding said transfer switch inits biased position, energy-storing means associated with said armatureand put in energy-stored condition by movement of said armature tostarting position, retarded means operated by the stored energy of saidenergy-sto 'ing means for releasing said holding means after a predetermined time, a switch for shunting said normally open' switch, acoil in said shunt circuit, means operated bysaid coil for operatingsaidtransfer switch against its bias, and'means operatively associated withsaid armature "for closing said shunt switch when said armature isoperated to starting positioll. I

'16. In an automatic motor starter having starting and runningpositions, starting and running coils, starting and running contacts,unitary movable contact means, operatively associated with said coils,for making butt contact with either said starting or running contacts,means for closing the circuit of said starting coil, and meansresponsive to the moven'ient of said contact means for closing thecircuitot said running coil a predetermined time after the closure ofthe starting coil circuit. I

17 In an automatic motor starterhaving off, starting and runningpositions, starting and running coils,starting and running contacts,unitary movable contact means, operatively associated with said coils,for making butt contact with either said starting or running contacts,means for closing the circuit of said starting coil, means for closingthe circuit of said running coil a predetermined time after the closureof said starting coil circuit, and means for biasing said movablecontactmeans to off position whereby when said running coil isdeenergized,said movable contact means will return to oil? position.,

18. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, means for shunting said circuit closing means, and aswitch for opening the circuit of said starting coil and closing thecircuit of said running coil through said shunting means.

19. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, means for shunting said circuit closing means, a switchfor opening the circuit of said starting coil and closing the circuit ofsaid running coil through said shunting means, and means for opening thecircuit of said shunting means upon energization of said running coil.

20. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, means for shunting said circuit closing means, a switchfor opening the circuit of said starting coil and closing the circuit ofsaid running coil through said shunting means, and means for holdingsaid switch in its last named position and for opening the circuit ofsaid shunting means upon energization ofv said running coil.

21. In an automatic motor starter having starting and running postions,starting and running coils, means for closing the circuit of saidstarting coil, means for shunting said circuit closing means, means fortransferring energization from said starting to said running coilthrough said shunting means, means for opening the circuit of saidshunting means upon energization of said running coil, and means, uponthe opening of said shunt circuit, for introducing an impedance into thecircuit of said running coil.

22. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, a switch for opening the circuit of said starting coiland closing the circuit of said running coil, means for shunting saidcircuit closing means upon energization of said starting coil, means foroperating said transfer switch a predetermined time after saidenergization, means whereby upon initial operation of said switch. saidrunning coil is energized through said shunting means, and meansresponsive to the energization of said running coil for opening thecircuit of said shunting means and estab lishing another circuit forsaid running coil.

23. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, a switch for transferring energization from said startingto said running coil, means for shunting said circuit closing means uponenergization of said starting coil, means for operating said transferswitch a predetermined time after said energization, means whereby uponthe operation of said transfer switch said running coil is energizedthrough said shunting means, and means responsive to the energization ofsaid running coil for opening the circuit of said shunting means andestablishing a circuit through an impedance for said running coil.

24. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, a switch for transferring energization from said startingto said running coil, means for forming a shunt circuit around saidcircuit closing means upon energization of said starting coil, saidshunt circuit including a magnet and means whereby a predetermined timeafter energization of said starting coil said magnet operates saidtransfer switch.

25. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, a switch for transferring energization from said startingto said running coil, said transfer switch being biased to a positionwhere it closes the circuit of said starting coil, means energized inresponse to the energization of said starting coil tending to move saidtransfer switch against said bias, and means operative a predeterminedtime after energization of said starting coil for permitting efiectiveaction of the means tending to move said transfer switch.

26. In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, means including electroresponsive means for shunting saidcircuit closing means, a switch for transferring energization from saidstarting coil to said running coil, means for releasably holding saidtransfer switch in starting position, and means operative apredetermined time after energization of said starting coil forreleasing said holding means whereby said electroresponsive meansoperates said transfer switch.

27 In an automatic motor starter having starting and running positions,starting and running coils, means for closing the circuit of saidstarting coil, a switch for transferring energization from said startingto said running coil, said transfer switch being normally biased tostarting position, means for operating said transfer switch apredetermined time after energization of said startin" coil, and meansresponsive to movement of said controller to running position forholding said transfer switch in running position.

28. In an automatic motor starter having starting and running positions,a starting coil, a running coil, an armature for said transformer to theline and then directly other direction to cause the running connectionsto be made, means for closing the circuit of said starting C01l, meansassociated fvvith said armature for shunting said circuit closing means,and means in circuit with said shunting means for holding the latterclosed.

29. In an automatic motor starter of the type for connecting a motorfirst through a to the line, a starting coil,a running coil,

an armature for saidcoils, means for closing the circuit of saidstarting coil, means associated with said armature for shunting saidcircuit closmgmeans, means for establishing a circuit for said runningcoil through said shunting means, and means in circuit with saidshunting means for holding thelatter closed. I

30. In anautoinatic motor starterhaving starting and running positions,a starting coil, a running coil, an armature for said coils movable inone direction to cause the starting connections to be made and inanother direction to cause the running connections to be made, means forclosing the circult of said startingcoil, means associated 1 saidarmature tor shunting said circuit closing means, means for establishinga circuit for said running coil through said shunting means, and meansin circuit with said shunting means for holding the latter closed.

31. In an automatic motor controller having two operative positions, acontrol coil each of said positions, a control switch for one of saidcoils, an armature ior sait. last named coil, means associated with saidarmature for shunting said control. switch, and means for interruptingthe circuit thro e'h s id coil and establishing a circuit for tie othercoil through said shunting means.

32. In an automatic motor starter having starting and running positions,starting and running coils, a control switch for closing the circuitoit' said starting coil, a switch for transferring energization fromsaid starting to said running coil, means for shunting said controlswitch including an electromagnet and a core therefor and a second corefor said electromagnet operatively associated with said transfer switch.

33. In an automatic motor starter of the type for connecting a motorfirst through a voltage reducing device to the line and then directly tothe line, electromagnetically operated actuating means thereforincluding an operating coil for causing the starter to make the startingconnections, a control switch for closing the circuit of said-operatingcoil, a relay contact in the circuit of said operating coil, a shuntcoil operatively related to said relay contact for actuating saidcontact to thereby decnergize said operating coil, means whereby themovement of said starter to starting position causes energization ofsaid relay coil, and means for delaying said actuation oi said relaycontact by said relay coil after said coil has been energized.

34. In anautoniatic motor starter oi the type for connecting a motorfirst through a voltage reducing device to the line and then directly tothe line, electromagnetically operated actuating means thereforincluding an operating coil for causing the starter to make the startingconnections, av control switch for closing the circuit of said operatingcoil, a relay contact in the circuit of said operating coil, a shuntcoil operatively related to said relay contact for actuating saidcontact to thereby deenergize said operating coil, means whereby themovement of said starter to starting position causes energiaation ofsaid relay, coil, and means actuation of said, relay contact by saidrelay coil after said relay coil has been energized, until theoccurrence of predetermined conditions.

35. In an automatic motor starter of the type for connecting a motorfirst through a voltage reducing device, to the line and then directlyto the line, electromagnetically operated actuatingmeans thereforincluding an operating coil for causing the starter to make the startingconnections, a control switch for closing the circuit of said operatingcoil, a relay contact in the coil, a coil operatively related to said.relay contact for actuating said contact to thereby deenergize saidoperating coil, means whereby the movement of said starter to startingposition causes energization of said relay coil, and means for delayingfor a predetermined time said actuation of said relay contact by saidrelay coil after said coil has been energized.

36. In an automatic motor starter having a single movable switch memberfor connecting a motorfirst througl'i a voltage reducing device totheline and then directly to the line, electromagnetically operatedactuating means therefor including a starting coil for causing thestarter to make the starting connections and a running coil for holdingthe starter in the running position, a control switch for closing thecircuit of said starting coil, a relay contact in the circuit of saidstarting coil, a coil operatively related to said relay contact foractuating said contact to thereby deenergize said starting coil. meanswhereby the movement of said starter to a starting position causesenergization ol said relay coil, means for delaying said actuation ofsaid relay contact by said relay coil after said coil has beenenergized, a contact in the circuit of said running coil, a spring forbiasing said starter away from the starting position, and meansoperatively associated for preventing said circuit of said operatingwith said starter and said contact in the circuit of said running coil.

37. In an automatic motor starter of the type for connecting a motorfirst through a voltage reducing device to the line and then directly tothe line, electromagnetically operated actuating means thereforincluding an operating coil for causing the starter to make the startingconnections, a control switch for closing the circuit of said operatingcoil, a relay contact in the circuit of said operating coil, a coiloperatively related to said relay contact for actuating said contact tothereby deenergize said operating coil, means whereby the movement ofsaid starter to starting position causes energization of said relaycoil,

latch for releasably holding said relay contact in the closed position,and means responsive to the movement of said starter, for releasing saidlatch to thereby permit said relay coil to open said relay contact,after said relay coil has been energized.

38. In an automatic motor starter of the type for connecting a motorfirst through a voltage reducing device to the line and then directly tothe line, electromagnetically operated actuating means thereforincluding an operating coil for causing the starter to make the startingconnections, a control switch for closing the circuitof said operatingcoil, a relay contact in the circuit of said operating coil, a coiloperatively related to said relay contact for actuating said contact tothereby deenergize said operating coil, means whereby the movement ofsaid starter to start ing position causes energization of said relaycoil, a latch for releasably holding said relay contact in the closedposition, and means for releasing said latch to thereby permit saidrelay coil to open said relay contact a predetermined time after saidrelay coil has been energized.

39. In an automatic motor starter ot the type provided with a voltagereducing device, switch contacts mechanically connected together forconnecting a motor through said voltage reducing device to a line andmeans including other contacts for connecting said motor directly to theline, electromagnetically operated actuating means for said starterincluding two operating coils for causing the starter to make thestarting and running connections respectively, a control switch forclosing the circuit of said starting operating coil, a relay contactinitially in the circuit of said starting operating coil and movableinto the circuit of said running operating coil, a shunt coiloperatively related to said relay contact for actuating said contact tothereby deenergize said starting operating coil and energize saidrunning operating coil, means whereby movement of said starter tostarting position causes energization of said relay coil, means fordelaying said actuation of said relay contact by said relay COll a'ltcrsaid coil has been energized, and means including said relay cont-actfor maintaining said relay contact in said actuated position afteractuation thereof.

40. In an automatic motor starter of the type provided with a voltagereducing device, switch contacts mechanically connected togetherfor'connecting a motor through said voltage reducing device to a lineand means including other contacts for connecting said motor directly tothe line, electromagnetically operated actuating means for said starterincluding two operating coils for causing the starter to make thestarting and running connections respectively, a control switch forclosing the circuit of said starting operating coil, a relay contactinitially in the circuit of said starting operating coil and movableinto the circuit of said running operating coil, a shunt coiloperatively related to said relay contact for actuating said contact tothereby deenergize said starting operating coil and energize saidrunning operating coil, means whereby movement of said starter tostarting position causes energization of said relay coil, means fordelaying said actuation of said relay contact by said relay coil aftersaid coil has been energized, and means for maintaining said relay coilenergized after actuation of said relay contact including a circuitthrough said relay contact in its running position.

In testimony whereof, the signature of the inventor is atlixcd hereto.

HERBERT V. CHENEY.

